U.S. patent number 3,910,441 [Application Number 05/446,695] was granted by the patent office on 1975-10-07 for vacuum insulated bottle.
This patent grant is currently assigned to Aladdin Industries, Inc.. Invention is credited to Carl Bramming.
United States Patent |
3,910,441 |
Bramming |
October 7, 1975 |
Vacuum insulated bottle
Abstract
A vacuum insulated bottle utilizing a wide opening vacuum filler
is disclosed. A thin walled liner is disposed in the interior of
the filler and extends upwardly therefrom to form a narrow mouth
opening to the lined interior for providing the pouring and thermal
insulating characteristics of a narrow mouth vacuum filler
bottle.
Inventors: |
Bramming; Carl (Nashville,
TN) |
Assignee: |
Aladdin Industries, Inc.
(Chicago, IL)
|
Family
ID: |
23773523 |
Appl.
No.: |
05/446,695 |
Filed: |
February 28, 1974 |
Current U.S.
Class: |
215/12.1 |
Current CPC
Class: |
A47J
41/0005 (20130101); A47J 41/02 (20130101) |
Current International
Class: |
A47J
41/00 (20060101); A47J 41/02 (20060101); A47J
041/02 () |
Field of
Search: |
;215/12A,13R,13A
;220/9C,9F,15 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Norton; Donald F.
Attorney, Agent or Firm: Rifkin; William T.
Claims
I claim:
1. A vacuum insulated bottle comprising:
a vacuum filler having a heat insulating interior for receiving
material therein and having a relatively wide opening to said
interior;
a protective jacket disposed about said filler;
a liner adjacent to closely conforming to disposed in the
temperature insulating interior of said filler and extending
upwardly therefrom to form a relatively narrow mouth opening to the
lined interior, said liner being attached to the jacket at the
liner's upper end; and
a collar formed of heat insulating material disposed in a cavity
formed between the jacket and the liner near said wide opening.
2. The vacuum insulated bottle of claim 1 further including:
a stopper adapted to close said narrow mouth opening; and
a cap engageable on said jacket for covering the stopper and narrow
mouth opening.
3. The vacuum insulated bottle of claim 2 wherein said stopper
extends into said interior to a position at or below the top of
said liner thereby to define a fill level for said bottle which is
at or below the top of said liner for optimizing the thermal
insulating capability of the bottle.
4. The vacuum insulated bottle of claim 1 wherein the heat
insulating material is a rigid foam adapted to support said liner
near the top of the filler.
5. The vacuum insulated bottle of claim 1 wherein heat insulating
material is selected from the group comprising:
fluorocarbon expanded urethane foam, carbon dioxide expanded
urethane foam, and polystyrene foam.
6. The vacuum insulated bottle of claim 1 wherein said liner is
thin walled to reduce conductive heat loss.
7. The vacuum insulated bottle of claim 1 wherein said liner is
selected from the group of materials comprising:
polypropylene, ABS, acetal, polycarbonate, modified PPO, nylon,
polysulphone, HDPE and polybutylene therathalate.
8. The vacuum insulated bottle of claim 1 wherein the liner is
produced by blow molding.
9. The vacuum insulated bottle of claim 1 wherein the liner is heat
welded to the jacket to prevent leakage into said cavity.
10. A thin walled liner providing a narrow mouth opening to a
vacuum insulated bottle having a relatively wide opening vacuum
filler, said liner adjacent to and closely conforming to the
interior of said filler and extending upwardly and inwardly
therefrom to form said narrow mouth opening.
11. The vacuum insulated bottle of claim 9 wherein said liner is
selected from the group of materials comprising:
polypropylene, ABS, acetal, polycarbonate, modified PPO, nylon,
polysulphone, HDPE and polybutylene therathalate.
Description
BACKGROUND OF THE INVENTION
The present invention relates to the field of containers for
maintaining liquid and solid materials, such as food, at a
substantially constant temperature over a relatively long period of
time. One highly successful device for accomplishing this objective
is a Dewar flask or thermos bottle. Such a container employs a
double wall filler which may be made of metal or glass and from
which air is substantially evacuated.
It is known in the prior art to provide narrow mouth thermos
bottles which are well situated for storing and pouring liquids and
which utilize a tall and relatively small diameter vacuum filler.
Wide mouth thermos bottles employ a vacuum filler of a larger
diameter and have a protective liner which conforms to the internal
wall of the filler. Such a thermos, while being well suited to the
storing and dispensing of solid and semi-solid foods such as soups,
has the disadvantage of a lower thermal insulating capability than
the narrow mouth design. Further, liquids are somewhat more
difficult to pour without spilling.
It is accordingly an object of the present invention to obtain the
thermal insulating capability and pouring characteristics of a
narrow mouth thermos while at the same time utilizing a wide mouth
filler for the thermos.
It is another object of the present invention to provide a thermos
which utilizes a wide mouth vacuum filler but has the pouring
characteristics of a narrow mouth thermos.
It is a further object of the present invention to provide a narrow
mouth thermos with a liner for preventing mixing of filler
particles with food stored therein should the vacuum filler
break.
It is another object of the present invention to provide a thin
wall liner for converting a wide mouth vacuum filler for narrow
mouth pouring.
Other objects and advantages of the present invention will become
apparent from the remaining portion of the specification.
SUMMARY OF THE INVENTION
A thermos bottle utilizing a large diameter vacuum filler is
disclosed. The filler is surrounded by a protective jacket and
supported on a base. A liner disposed within the material receiving
portion of the filler extends upwardly from the filler to form a
narrow mouth opening to the lined interior. The liner is attached
to the jacket near its upper end. A heat insulating material is
disposed in a cavity defined by the area between the protective
jacket and the liner near the top portion of the vacuum filler.
DESCRIPTION OF THE DRAWING
The FIGURE is a longitudinal section through a thermos according to
the invention and having portions broken away.
DETAILED DESCRIPTION
Referring to the FIGURE, the thermos 10 includes a Dewar flask or
vacuum filler 12. The filler is preferably formed of glass although
steel can be used. The filler is a double wall structure of
generally cylindrical construction having an inner wall 14 and an
outer wall 16. An airtight chamber 18 is defined by the area
between the walls from which air is evacuated through an opening in
the bottom of the filler in a manner well known in the art. The
walls 14 and 16 may be silvered on the inside to reduce radiant
heat loss.
The filler is supported on a base 20 which may be integral with or
attached by conventional means to a protective jacket 22. The
filler has an opening 23 to its insulating interior. The jacket,
which may be of plastic, surrounds the filler 12 to prevent damage
thereto. The jacket 22 has a tapered portion 24 which tapers
inwardly above the filler opening 23 for a reason to be
explained.
Disposed in the insulating interior of the filler 12 is a
protective liner 28. The liner conforms to the inner wall 14 of the
filler and is thin walled to reduce conductive heat loss. It may be
formed from any desired material having suitable heat
characteristics and which is safe for use with food. Preferred
materials include:
Polypropylene ABS Acetal Polycarbonate Modified PPO Nylon
Polysulphone HDPE Polybutylene Therathalate
The liner 28 may be formed by blow molding, preferably injection
blow molding so that it closely conforms to the glass filler. The
liner should not, however, be so snug against the filler that
thermal expansion thereof causes excessive stress on the filler or
buckling of the liner.
Near the filler opening 23 the liner 28 tapers inwardly and
upwardly along a section 30 and then becomes cylindrical in cross
section forming a relatively small diameter opening 32 to the lined
interior of the thermos. In this manner the liner 28 serves to
convert or translate a wide mouth thermos including a wide opening
filler 12 into a thermos that has the liquid pouring and thermal
insulating characteristics of a narrow mouth thermos. The liner
also provides protection against glass particles from a broken
filler mixing with the thermos contents.
In order to obtain optimum thermal insulation the fill level of the
thermos should be at or below the filler opening 23 as illustrated
in the FIGURE. This can be accomplished by utilizing a stopper
which extends into the lined interior to a position at or below the
filler opening 23.
The liner 28 and the protective jacket 22 are attached to each
other at their upper ends for the purpose of preventing moisture,
dirt or the contents of the thermos from entering the cavity
between the jacket and liner during cleaning or pouring. They may
be attached by heat welding, adhesive bonding or a mechanical lock.
The FIGURE illustrates a heat weld portion 34 joining the jacket to
the liner.
A key element of the present invention is the provision of a
thermal insulating collar 36 in the sealed cavity between the
jacket and liner near the filler opening 23. This insulating collar
is preferably a foam collar which can be premolded as a one-piece
ring or as a split ring. The insulating collar 36 conforms to the
shape of the sealed cavity and serves to support and add rigidity
to the tapered section 30 of the liner 28. Further, the collar
provides thermal insulation in the tapered region which is not
insulated by the filler 12.
Any heat insulating material which can be formed to the required
shape can be used in the cavity such as a rigid insulating type of
urethane foam. Preferred materials for the collar are carbon
dioxide expanded urethane foam, fluorocarbon expanded urethane
foam, and polystyrene foam.
The top of jacket 22 has external threads 38 thereon for engaging a
threaded stopper 40 in the narrow mouth opening 32. The stopper
seats on a rim 42 to seal the lined interior of the thermos for
storage. A combination protective cap and drinking cup 44 is
secured onto the jacket 22 by threads 46.
As an indication only, of the improved thermal insulating
characteristics which may be obtained with the present invention,
it has been found that the temperature loss in a quart size thermos
over a four-hour period with water initially at
205.degree.-210.degree. F. was:
11.degree. F. in a narrow mouth standard thermos,
22.degree. F. in a wide mouth standard thermos, and
14.degree. F. in a thermos having a wide mouth filler with the
narrow mouth conversion liner of the present invention and filled
to the top of the filler.
While I have shown and described embodiments of this invention in
some detail, it will be understood that this description and
illustrations are offered merely by way of example, and that the
invention is to be limited in scope only by the appended
claims.
* * * * *